#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <ctype.h>

//int main()
//{
//	int ret = islower(55);
//	printf("%d\n", ret);
//	return 0;
//}

//int main()
//{
//	printf("%c\n", tolower('A'));
//	printf("%c\n", tolower('a'));
//	printf("%c\n", tolower('9'));
//	return 0;
//}

int main()
{
	char arr[] = "hi , I am A Student .";
	int i = 0;
	while (arr[i])
	{
		if (islower(arr[i]))
			//arr[i] -= 32;
			arr[i] = toupper(arr[i]);
		i++;
	}
	printf("%s\n", arr);
	return 0;
}
